Pivot joint and vehicles that employ a pivot joint

ABSTRACT

In an aspect, a pivot joint for a collapsing foot-deck-based vehicle is described, comprising a foot deck, at least two wheels coupled to the foot deck, and a handlebar assembly coupled to the foot deck via a locking pivot joint, also referred to as a locking swivel joint, the handlebar assembly comprising at least one handle, the locking pivot joint having a pivot axis that is generally unparallel with a horizontal plane defined by the lowermost surfaces of the at least two wheels, the handlebar assembly being selectively pivotable via the locking pivot joint between a riding configuration in which the handle is generally distal from the foot deck and a collapsed configuration in which the handle is generally proximal to the foot deck.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to U.S. Provisional Patent ApplicationNo. 62/350,633 filed Jun. 15, 2016, to U.S. Provisional PatentApplication No. 62/377,541 filed Aug. 20, 2016, and to U.S. ProvisionalPatent Application No. 62/483,906 filed Apr. 10, 2017, the contents ofall of which are incorporated herein in their entirety.

FIELD OF THE DISCLOSURE

The specification relates generally to pivot joints and moreparticularly for pivot joints used in foot-deck-based vehicles and othervehicles, permitting portions of such vehicles to be lockable in atleast two positions.

BACKGROUND OF THE DISCLOSURE

Vehicles, such as foot-deck based vehicles, such as scooters, havebecome very popular. In many cases, the foot deck on such vehicles has along fore-aft dimension to accommodate both feet of a rider atopthereof, one behind the other. These foot-deck-based vehicles typicallyhave two or more wheels, with at least one at each end thereof along thefore-aft dimension.

Some foot-deck-based vehicles include handlebar assemblies that can begrasped during operation. The handlebar assemblies may include ahandlebar stem that extends upward from the foot deck. In some caseshandlebar handles extend substantially laterally from an opposite end ofthe handlebar stem.

Without providing a folding mechanism for folding the handlebar assemblyrelative to the foot deck, these vehicles could require relatively largespaces for storage or transport. Further, such foot-deck-based vehiclesmay be difficult to transport when not being ridden, as they can beunwieldy to carry.

In some cases, these foot-deck-based vehicles are designed to becollapsible to facilitate storage and carrying. Typically, a down tubeconnecting a foot deck assembly, which includes the foot deck and therear wheel(s), and a head assembly, which includes a head tube in whichthe handlebar assembly and front wheel assembly is received, is jointedor is connected to the foot deck assembly via a joint to permit foldingof the head assembly relative to the foot deck assembly.

FIG. 1A shows an exemplary collapsing foot-deck-based vehicle 20 havinga foot deck assembly 24 and a head assembly 28. The foot deck assembly24 includes a foot deck 32 having a fore end 36 and an aft end 40. Thefoot deck 32 has a generally flat upper surface upon which a rider'sfeet are positioned and may include a traction insert or surfaceadhesive to reduce slippage between the rider's feet and the foot deck32. A rear wheel 44 is coupled to the foot deck 32 adjacent the aft end40, and a rear fender 48 inhibits a rider's feet from contacting therear wheel 44 directly when positioned atop of the foot deck 32. A jointplate 52 is secured at the fore end 36 of the foot deck 32, and has atleast two position holes through which a locking bolt attached to aposition knob 55 extends, with a first position hole 54 a being shown. Acorresponding locking nut enables securement of the locking bolt in theposition holes. The head assembly 28 includes a head tube 56 coupled toa down tube 60. The head tube 56 receives a handlebar assembly 64 and afront wheel assembly 68. The handlebar assembly 64 includes a handlebarstem 72 connected to a pair of handlebar handles 76. The front wheelassembly 68 includes a front wheel 80. Where the foot-deck-based vehicle20 is steerable via the handlebar handles, the handlebar assembly 64 canbe directly coupled to the front wheel assembly 68 and rotatablyreceived by the head tube 56.

The head assembly 28 is rotatably coupled to the joint plate 52 of thefoot deck assembly 24 via a pivot bolt 84 that extends through the downtube 60 and the joint plate 52. The foot-deck-based vehicle 20 is shownin a riding configuration in FIG. 1A. In order to collapse thefoot-deck-based vehicle 20 from the riding configuration to a collapsedconfiguration, the locking nut attached to the locking bolt is removedand the locking bolt is withdrawn from a second position hole. The headassembly 28 can then be rotated about the pivot bolt 84 to fold thehandlebar assembly 64 towards the foot deck assembly 24.

FIG. 1B shows the foot-deck-based vehicle 20 in a collapsedconfiguration. The head assembly 28 has been folded down about the pivotbolt 84 towards the foot deck assembly 24. The second position hole 54 bin which the locking bolt was secured is now exposed, and the lockingbolt is secured in the first position hole 54 a via the locking nut. Ascan be seen, in this collapsed configuration, the foot-deck-basedvehicle 20 is more compact for storage and more readily portable.

There are a number of drawbacks with such designs for collapsingfoot-deck-based vehicles. For example, the fasteners used to lock theposition of the head assembly relative to the foot deck assembly can bedifficult to secure tightly, causing the joint to rattle. Further, thestructural integrity of the foot-deck-based vehicle can be weakened bythe placement of the joint between the foot deck and the front wheelassembly. As a result, complex and/or large structural additions aremade to the foot-deck-based vehicles.

SUMMARY OF THE DISCLOSURE

According to an aspect, there is provided a collapsing foot-deck-basedvehicle, comprising a foot deck, at least two wheels coupled to the footdeck, and a handlebar assembly coupled to the foot deck via a pivotjoint, the handlebar assembly comprising at least one handle, thelocking pivot joint having a pivot axis that is generally unparallelwith a horizontal plane defined by the lowermost surfaces of the atleast two wheels, the handlebar assembly being selectively pivotable viathe locking pivot joint between a riding configuration in which thehandle is generally distal from the foot deck and a collapsedconfiguration in which the handle is generally proximal to the footdeck.

The pivot axis can be inclined between about 30 degrees and about 60degrees from the horizontal plane.

The foot deck can comprise a generally planar portion, and a generallysloped portion extending from the generally planar portion at a fore endthereof.

The pivot joint can be positioned at the generally sloped portion of thefoot deck.

The pivot joint can comprise a first locking face of the handlebarassembly that mates with a second locking face of the foot deck.

The pivot joint can further comprise a biasing member that exerts abiasing force in at least a pivot mode to bias the first locking faceand the second locking face together, the biasing force beingsufficiently weak to permit pivoting of the first locking face about thepivot axis relative to the second locking face when a threshold torqueis applied to the handlebar assembly relative to the foot deck. Thebiasing member may form part of a locking mechanism that can lock thepivot joint in at least one position.

Each of the first locking face and the second locking face can comprisea pattern of protrusions projecting from a face plane at angularintervals around the pivot axis to which the face plane is orthogonaland defining an angular period.

The protrusions can extend radially.

The protrusions can be free of generally radially extending edges.

The locking mechanism can be conditioned to a locked mode in which thelocking mechanism exerts a locking force to lock the patterns ofprotrusions of the locking faces of the handlebar assembly and the footdeck together, the locking force being sufficiently strong to inhibitrotation of the handlebar assembly about the pivot axis relative to thefoot deck when a torque is applied to the handlebar assembly relative tothe foot deck.

The locking mechanism can be conditioned to a locked mode in which thelocking mechanism exerts a locking force to lock the first locking faceand the second locking face together, the locking force beingsufficiently strong to inhibit rotation of the handlebar assembly aboutthe pivot axis relative to the foot deck when a torque is applied to thehandlebar assembly relative to the foot deck.

The collapsing foot-deck-based vehicle can further comprise a firstfeature on the handlebar assembly, and a second feature on the foot decklimiting pivoting of the handlebar assembly relative to the foot deck.

One of the first feature and the second feature can comprise aprotuberance, and wherein the other of the first feature and the secondfeature can comprise an arcuate slot dimensioned to receive theprotuberance.

According to another aspect, there is provided a collapsingfoot-deck-based vehicle, comprising a foot deck, at least two wheelscoupled to the foot deck, each of said wheels having a rotation axis,and a handlebar assembly coupled to the foot deck via a locking pivotjoint, the handlebar assembly comprising at least one handle, thelocking pivot joint having a pivot axis that is generally unparallel tothe rotation axes of the wheels, the handlebar assembly beingselectively pivotable via the locking pivot joint between a ridingconfiguration in which the handle is generally distal from the foot deckand a collapsed configuration in which the handle is generally proximalto the foot deck.

According to an aspect, there is provided a pivot joint including:

a first pivot member and a second pivot member, each of the first pivotmember and the second pivot member having a locking face with a patternof protrusions projecting from a face plane at angular intervals arounda pivot axis to which the face plane is orthogonal and defining anangular period, each protrusion including:

a first surface region having an inclination angle relative to the faceplane;

a second surface region having a declination angle relative to the faceplane; and

a third surface region extending at least about 10% of the angularperiod, the third surface region transitioning between the inclinationangle and the declination angle and including an apex of the protrusion,the third surface region being free of planar portions that aresubstantially parallel to the face plane; and

a biasing member exerting a biasing force in a pivot mode to bias thelocking faces of the pivot members together, the biasing force beingsufficiently weak to permit rotation of the first pivot member about thepivot axis relative to the second pivot member when a threshold torqueis applied to the first pivot member relative to the second pivotmember.

The protrusion can be free of surface regions having an inclinationangle of more than about 60 degrees.

The protrusions can extend radially.

The pattern of protrusions of the first pivot member can complement thepattern of protrusions of the second pivot member.

The protrusions can be free of generally radially-extending edges.

The inclination angle can be generally equal in magnitude to thedeclination angle.

The biasing force can be a first biasing force, and the biasing membermay be part of a biasing mechanism that can be conditioned to a lockedmode in which the biasing mechanism exerts a second biasing force tobias the patterns of protrusions of the locking faces of the first pivotmember and the second pivot member together, the biasing force beingsufficiently strong to inhibit rotation of the first pivot member aboutthe pivot axis relative to the second pivot member when a torque isapplied to the first pivot member relative to the second pivot member.

According to another aspect, there is provided a quick releasemechanism, including:

a frame including an aperture and a recess in the surface; and

a quick release skewer including:

a tensioner member extending through the aperture;

an anchor member secured to a first end of the tensioner member; and

a lever having a cam-shaped portion pivotally coupled to a second end ofthe tensioner member distal from the first end, and a lever portionextending from the cam-shaped portion for rotating the cam-shapedportion between a first orientation and a second orientation in whichtension is increased on the tensioner, and at least one of thecam-shaped portion and the lever portion nests in the recess.

The lever portion can nest in the recess. The recess can be longer thanthe lever portion.

The cam-shaped portion can nest within the recess.

According to a further aspect, there is provided a pivot joint,including:

a first pivot member and a second pivot member, each of the first pivotmember and the second pivot member having a locking face with a patternof protrusions projecting from a face plane at angular intervals arounda pivot axis to which the face plane is orthogonal and defining anangular period, each protrusion having a visible width between apexes ofat least about three millimeters and at least about three millimeters inheight relative to the face plane; and

a biasing member exerting a biasing force in a pivot mode to bias thelocking faces of the pivot members together.

The biasing force can be sufficiently weak to permit rotation of thefirst pivot member about the pivot axis relative to the second pivotmember when a threshold torque is applied to the first pivot memberrelative to the second pivot member.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments will now be described, by way of example only, withreference to the attached figures, wherein:

FIG. 1A is a side view of a prior art collapsible foot-deck-basedvehicle in a riding configuration;

FIG. 1B is a side view of the prior art collapsible foot-deck-basedvehicle of FIG. 1A in a collapsed configuration;

FIG. 2 is a front perspective view of a collapsible foot-deck-basedvehicle having a locking pivot joint, in accordance with an embodimentof the present disclosure;

FIG. 3 is an exploded section view of the locking pivot joint of thescooter of FIG. 2;

FIG. 4 is a bottom perspective view of a handle support member of FIG.3;

FIG. 5 is a side perspective view of a locking face of the locking pivotjoint of FIG. 3;

FIG. 6A is a partial side cross-section view of the locking pivot jointof FIG. 3 in a riding configuration, with a cam lock lever in a lockposition;

FIG. 6B is a side cross-section view of the cam lock lever in a releaseposition;

FIG. 7 is a partial side cross-section view of the locking pivot jointof FIG. 3 in a collapsed configuration;

FIG. 8A is a perspective view of another collapsible foot-deck basedvehicle in a riding configuration having a locking pivot joint, inaccordance with another embodiment of the present disclosure;

FIG. 8B is a perspective view of the collapsible foot-deck based vehicleshown in FIG. 8A in a collapsed configuration;

FIGS. 9 and 10 are perspective partially exploded views of thecollapsible foot-deck based vehicle shown in FIG. 8A;

FIG. 11 is a magnified perspective view of the locking pivot joint shownin FIG. 8A in a transitional position;

FIG. 12 is a magnified perspective view of the locking pivot joint shownin FIG. 8A in an end position;

FIG. 13 is a magnified perspective view of a portion of the lockingpivot joint that is shown in FIG. 11;

FIG. 14 is a magnified perspective view of another portion of thelocking pivot joint that is shown in FIG. 11;

FIG. 15 is a plan view of the portion of the locking pivot joint that isshown in FIG. 13;

FIG. 16 is a plan view of the portion of the locking pivot joint that isshown in FIG. 14;

FIG. 17 is a magnified perspective view that is a portion of thefoot-deck based vehicle shown in FIG. 10;

FIG. 18 is a magnified perspective view that is a portion of thefoot-deck based vehicle shown in FIG. 9;

FIG. 19 shows a rear perspective view of a sport stroller in accordancewith an embodiment of the disclosure;

FIG. 20 shows a side view of the sport stroller of FIG. 19;

FIG. 21 shows a rear view of the sport stroller of FIG. 19;

FIG. 22 shows a rear perspective sectional view of the sport stroller ofFIG. 19 with a partially exploded view of a pivot joint for a rearwheel;

FIG. 23 shows an exploded sectional view of the right rear wheel andpivot joint of the sport stroller of FIG. 19;

FIG. 24 shows the pattern of protrusions of a locking face of a wheelpivot joint of the sport stroller of FIG. 19;

FIG. 25 shows the profile of the protrusions of the locking face of FIG.24 along a line of fixed radius from a pivot axis of the wheel pivotjoint;

FIG. 26 shows a exploded sectional view of a pivot joint connecting rearwheel struts of the sport stroller of FIG. 19;

FIG. 27 shows a sectional view of the rear wheels, rear wheel struts,and central pivot joint of the sport stroller of FIG. 19;

FIG. 28 shows the profile of the protrusions of FIG. 25 in comparison tothe profile of prior art protrusions;

FIG. 29 shows the profile of a pattern of protrusions in accordance withan alternative embodiment; and

FIG. 30 shows the profile of a pattern of protrusions in accordance withanother alternative embodiment.

DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS

It is understood that the terms “couple”, “coupled”, “connect”,“connected” are not limited to direct mating between the describedcomponents, but also contemplate the use of intermediate components toachieve the connection or coupling.

FIG. 2 depicts a collapsing foot-deck-based vehicle in accordance withan embodiment. In particular, the foot-deck-based vehicle is athree-wheeled scooter 100. Although the example foot-deck-based vehicleis depicted as a three-wheeled scooter, it is understood that thefoot-deck-based vehicle is not limited to a scooter and may be any otherfoot-deck-based vehicle having a handlebar assembly. The scooter 100includes a foot deck assembly 104 and a handlebar 108 (which may also bereferred to as a handlebar assembly 108). The foot deck assembly 104includes a foot deck 112 having a fore end 116 and an aft end 120 and alongitudinal axis A. The foot deck 112 has a generally flat uppersurface 124 (referred to also as a foot support surface 124) upon whicha rider's feet are positioned and may include a traction insert orsurface adhesive to reduce slippage between the rider's feet and thefoot deck 112. A rear wheel 128 is coupled to the foot deck 112 adjacentthe aft end 120.

A front wheel assembly 132 of the foot deck assembly 104 is pivotablycoupled to the foot deck 112 and includes a front wheel support 136 towhich two front wheels 140 are freely rotatably secured.

The scooter 100 is a lean-to-steer type scooter, and the design of thefront wheel assembly 132 and its connection with the foot deck 112 causethe scooter 100 to turn in a direction corresponding with a lateral sideof the foot deck 112 to which a rider has shifted their weight. Thefront wheel assembly 132 includes a centering mechanism for biasing thefront wheel assembly 132 to a neutral center position when the frontwheel assembly 132 is pivoted to either side.

The rear wheel 128 and the front wheels 140 may be made of polyurethaneand have rotation axes that are generally laterally and parallel to aflat surface upon which the scooter 100 is positioned.

The handlebar assembly 108 includes a handle support member 144 that hasa tubular upper end. A handlebar stem 148 is friction fit and secured inthe handle support member 144 at a first lower end thereof, such as viafasteners, bonding, etc. The handlebar stem 148 is also tubular and hasa quick release clamp 152 at a second upper end thereof that secures ahandlebar insert 156 via an elongated neck 160 thereof that is insertedinto the second upper end of the handlebar stem 148 so that a pair ofhandlebar handles 164 of the handlebar insert 156 is fixed at a desiredheight from the flat upper surface 124 of the foot deck 112. Thehandlebar handles 164 have rubber inserts 168 to provide grip andcomfort to a rider. The height of the handlebar handles 164 can beadjusted as desired to accommodate for the dimensions of a rider, therider's preferences or other factors.

The handlebar assembly 108 is connected to the foot deck 112 via alocking pivot joint 171 that is selectively locked and unlocked viaactuation of a quick release lever 172 (also referred to as a cam locklever 172).

FIGS. 3 and 4 show the various elements of the locking pivot joint ingreater detail. The locking pivot joint 171 is positioned at a generallyinclined portion of the foot deck 112. The foot deck 112 has a generallyplanar portion 176 which has the foot support surface 124 and agenerally sloped portion 180 extending from the generally planar portion176 at a fore end thereof. The generally sloped portion 180 is slopedrelative to the generally planar portion 176. In the illustratedembodiment, the generally planar portion 176 is long relative to thegenerally sloped portion 180, as it is designed to support both feet,end to end, of a rider. Further, the generally sloped portion 180 slopesabout 45 degrees from the generally planar portion 176, which isgenerally coplanar with a horizontal surface upon which the scooter 100travels.

A pivot hole 184 extends through the generally sloped portion 180 of thefoot deck 112. A locking face 188, which may optionally be annular,which is formed on a top surface of the generally sloped portion 180 ofthe foot deck 112, is proximate the pivot hole 184. An arcuate groove192 extends about 180 degrees around the locking face 188.

The handle support member 144 has a diagonally sloped end face 194 at anangle of about 45 degrees. A tensioner member 196, (which may also bereferred to herein as a tensioner rod 196 in embodiments wherein it isan elongate rod), is secured at one end to the quick release lever 172and passes through a tensioner port 200 in the handle support member144. The tensioner member 196 extends generally orthogonally from theslope of the lower end, through the pivot hole 184 in the generallysloped portion 180, and is secured at another end to a tensioner anchor204. The quick release lever 172 is hingedly connected to the handlesupport member 144 and acts to tension or release tension from thetensioner member 196.

A locking face 208, (which may optionally be annular), and whichcorresponds with the locking face 188 of the generally sloped portion180 of the foot deck 112, is disposed on the diagonally sloped end face194 of the handle support member 144. A limiter post 212 protrudesorthogonally from the diagonally sloped end face 194 adjacent thelocking face 208.

The locking face 188 of the generally sloped portion 180 of the footdeck 112 is substantially a mirror image of the locking face 208 of thehandle support member 144.

FIG. 5 shows the locking faces 188 and 208 in greater detail. Thelocking faces 188 and 208 each have a plurality of protrusions 213(which may also referred to as projections 213) that project from a faceplane 216 at regular angular intervals around a pivot axis P, which isorthogonal to the face plane 216. The plurality of protrusions 213 inthe embodiment shown are in the form of a regular pattern in which theprotrusions 213 are all the same size and shape. The pattern ofprotrusions 213 is generally sinusoidal in profile along a circular patharound the pivot axis P, with the protrusions 213 extending radiallyabout the pivot axis P. The protrusions 213 are free of generallyradially-extending edges, but may have radially-extending edges in otherembodiments. The protrusions 213 may be said to alternate with aplurality of valleys shown at 215.

Referring now to FIG. 6A, the pivot axis P in the scooter 100 isinclined about 45 degrees from the horizontal plane defined by the lowersurfaces of the rear wheel 128 and the front wheels 140 of the scooter100. As the main portion of the handlebar assembly 108 (mainly thehandlebar stem 148) is generally straight, the handlebar assembly 108can extend from the pivot axis P at a 45 degree angle to pivot betweenan upright riding configuration, in which the handlebar handles 164 aregenerally distal from the foot deck 112, and a generally horizontalcollapsed configuration, in which the handlebar handles 164 aregenerally proximal to the foot deck 112.

The scooter 100 is shown in FIG. 6A assembled in a riding configuration,wherein the handlebar assembly 108 extends generally perpendicularlyrelative to the generally planar portion 176 of the foot deck 112. Thelocking pivot joint is locked in the riding configuration to preventrelative movement of the handlebar assembly 108 relative to the footdeck 112 during use. In particular, the diagonal sloped end face 194 ofthe handle support member 144 is positioned against the generally slopedportion 180 so that the tensioner port 200 of the handle support member144 is aligned coaxially with the pivot hole 184 of the generally slopedportion 180 and the locking face 208 of the handle support member 144 isaligned and mated with the locking face 188 of the generally slopedportion 180. The tensioner member 196 extends from the quick releaselever 172, through the tensioner port 200 and the pivot hole 184, and issecured via the tensioner anchor 204.

The quick release lever 172 has two modes (positions) in which it can beconditioned (positioned). When the quick release lever 172 is in a lockposition (FIGS. 6A and 7), a locking portion of the cam surface shown at173 on the quick release lever 172 engages a cam surface engagementsurface 175 on the handle support member 144, which pulls the tensionermember 196. The pulling causes a clamping force to be applied betweenthe tensioner anchor 204 and the cam surface 173 clamping force to holdthe handle support member 144 and the generally sloped portion 180 ofthe foot deck 112 tightly against one another, and to hold theprotrusions of the locking face 188 in tight engagement with the valleysof the locking face 208 and the protrusions of the locking face 208 intight engagement with the valleys of the locking face 188, therebypreventing the locking faces 188 and 208 to be separated as required topivot the handlebar assembly 108 relative to the foot deck assembly 104.

When it is desired to collapse the scooter 100, the quick release lever172 can be actuated to a pivot position, also referred to as a releaseposition, (shown in FIG. 6B), thus applying a lesser tension along thetensioner member 196 (optionally zero tension), and thus a lessertension force (optionally, no tension force) urging the locking face 188of the generally sloped portion 180 of the foot deck 112 and the lockingface 208 of the handle support member 144 together. In this mode orposition, tension is sufficiently low to permit the locking faces 188and 208 to be separated sufficiently to pivot the locking face 188relative to the locking face 208 and thus to pivot the handlebarassembly 108 relative to the foot deck assembly 104. The handlebarassembly 108 may thus be pivoted from the use position to the collapsedposition. If the separation of the locking faces 188 and 208 is notgreat enough there will still be some interference between the peaks ofthe protrusions 213 as they pass over one another during pivoting of thelocking face 188 and the handlebar assembly 108. Thus, in suchembodiments, such pivoting may require application of a threshold torqueby the user on the handlebar assembly 108. The threshold torque issufficient to rotate the locking face 208 of the handle support member144 relative to the locking face 188 of the generally sloped portion 180of the foot deck 112, thus overcoming the remaining tension forceexerted by the tensioner member 196 that exists when the peaks pass overone another, and any friction between them.

Thus, the handlebar assembly 108 can be pivoted from its riding positionshown in FIG. 6A to a collapsed position shown in FIG. 7. The limiterpost 212 of the handle support member 144 is at one end of the arcuategroove 192 in the generally sloped portion 180 when the handlebarassembly 108 is in a riding configuration. As the handlebar assembly 108is pivoted relative to the foot deck assembly 104, the limiter post 212travels along the arcuate groove 192 and is limited from traveling pastthe collapsed position by a first end wall 193 of the arcuate groove192, thus facilitating pivoting of the handlebar assembly 108 to thecollapsed configuration/position. The aforementioned first end wall 193of the groove 192 may also be referred to as a first limit surface 193.

Once the handlebar assembly 108 is in the collapsed position, the camlock lever 172 can be moved to the lock position such that the camsurface 173 on the cam lock lever 172 and the tensioner anchor 204 applythe clamping force to the locking faces 188 and 208 so as to lock thehandlebar assembly 108 in the collapsed position.

As the handlebar assembly 108 is pivoted in the opposite direction,relative to the foot deck assembly 104, the limiter post 212 travels inthe opposite direction along the arcuate groove 192 (i.e. away from theend wall 193) and is limited from traveling past the use position by asecond end wall 195 of the arcuate groove 192, thus facilitatingpivoting of the handlebar assembly 108 to the useconfiguration/position. The aforementioned second end wall 194 may alsobe referred to as a second limit surface 194.

FIG. 7 shows the scooter 100 in a collapsed configuration after pivotingof the handlebar assembly 108. As shown, pivoting of the handlebarassembly 108 about the pivot axis P results in the handlebar assembly108 being generally parallel to the generally planar portion 176 of thefoot deck 112, and, although not shown, proximal positioning of thehandlebar handles 164.

While the foot deck of the vehicles in the above-described embodimentsare generally long, narrow boards extending along the fore-aft axis,other shapes and sizes can be used. For example, the handlebar assemblyarrangements can be adapted for use with foot-deck-based vehicles withY-shaped foot decks.

The angle of inclination between the pivot axis and the horizontal planedefined by the lower surfaces of the wheels of the scooter which afoot-deck-based vehicle travels can be varied. It has been generallyfound that angles of inclination between about 30 degrees and about 60degrees from horizontal enable suitable rotation of a handlebar assemblybetween a riding configuration and a collapsed configuration.Modifications to the handlebar assembly, such as a curved or benthandlebar assembly, may or may not vary these results.

The handlebar assembly may be varied from that described with referenceto certain embodiments above. For example, the handlebar handles may bereplaced with other types of handles, such as a single handlebar orhandle loop, ball, etc.

Other methods and mechanisms that lock the orientation of the handlebarassembly relative to the foot deck can be employed. For example, awinged nut mounted atop of a threaded bolt can apply sufficient lockingforce on the pivot joint to suppress undesired pivoting of the handlebarassembly during use or carriage.

Other mechanisms that can exert a biasing force in a pivot mode to biasthe locking faces together, wherein the biasing force is sufficientlyweak to permit rotation of the locking faces about the pivot axisrelative to each other when a threshold torque is applied to thehandlebar assembly relative to the foot deck. For example, helical coilor other springs, and/or electromagnets can be employed in place of orin addition to the tensioner member.

The foot deck can comprise posts, platforms, contours, extensions, andthe like to differently angle, elevate, or sink the pivot joint relativeto the foot deck.

Various configurations of locking faces can be employed. For example,one or both of the locking faces can be fitted with surfaces that aregenerally planar but have high coefficients of friction.

Various suitable features can be employed to facilitate the correctorientation of the handlebar assembly relative to the foot deck. Forexample, an external tab on the handlebar assembly can be limited to acertain range of pivoting about the pivot axis by corresponding featuresof the foot deck. In other embodiments, visual, audio, and or hapticfeedback can be provided to a person to indicate that a correctorientation of the handlebar assembly relative to the foot deck has beenachieved.

The term ‘pivot’ and related terms (e.g. ‘pivoting’, ‘pivoted’) havebeen used to describe the movement of the handlebar assembly 108 and thestructure that permits said movement. While the term ‘pivot’ and therelated terms are correct, the term ‘swivel’ and its related terms couldalso be used to describe the movement and the structure that permits themovement. Thus, the locking pivot joint referred to herein may also bereferred to as a locking swivel joint. Similarly, the pivot hole 184 andthe pivot axis P may alternatively be referred to as the swivel hole 184and the swivel axis P. Any reference to swivel or related words withinthe present disclosure could be replace with the term ‘swivel’.

The locking face 188 may be referred to as the first locking face andthe locking face 208 may be referred to as the second locking face 208.Alternatively, the locking face 208 may be referred to as the firstlocking face and the locking face 188 may be referred to as the secondlocking face.

Furthermore, the locking faces 188 and 208 may alternatively be referredto as engagement surfaces 188 and 208. Thus, either of the locking faces188 or 208 may be referred to as the first engagement surface 188 or 208as the case may be, and the other of the locking faces 188 or 208 may bereferred to as the second engagement surface 188 or 208.

Reference is made to FIGS. 8A and 8B which show a foot deck basedvehicle 300 that may be similar to the foot deck based vehicle 100 andwhich includes a foot deck 302 having a front end 304 (also referred asa fore end 304) and a rear end 306 (also referred to as an aft end 306)and a foot support surface 305, a front wheel assembly 308 with frontwheels 309 that may be similar to the front wheel assembly 132 and whichis mounted at the front end 304 of the foot deck 302 and a rear wheelassembly 310 with a rear wheel 311 that may be similar to the rear wheel44 and which is mounted at the rear end 306 of the foot deck 302. Thevehicle 300 further includes a handlebar mount 312 on the foot deck 302and a handlebar 314 (also referred to as a handlebar assembly 314) thatmay be similar to the handlebar assembly 108) and which extends up fromthe handlebar mount 312.

The handlebar mount 312 defines a handlebar pivot axis P. The handlebar314 is precessively pivotable about the handlebar pivot axis P between ause position (FIG. 8A) and a collapsed position, also referred to as astorage position (FIG. 8B). The handlebar 314 extends farther away fromthe foot deck 302 in the use position than in the storage position.Optionally, the handlebar 314 extends approximately perpendicular to thefoot support surface 305 when in the use position and is approximatelyparallel to the foot support surface 305 when in the storage position.

The handlebar mount 312 has a first handlebar mount engagement surface316 (also shown in plan view in FIG. 16) extending circumferentiallyabout the handlebar pivot axis P and having a first plurality ofhandlebar mount projections 318 which alternate with a first pluralityof handlebar mount valleys 320. An axial height H1 (FIG. 13) of thefirst plurality of handlebar mount projections 318 above the firstplurality of handlebar mount valleys 320 is a first height. Thehandlebar 314 has a first handlebar engagement surface 322 (also shownin plan view in FIG. 15) extending circumferentially about the handlebarpivot axis P and having a first plurality of handlebar projections 324which alternate with a first plurality of handlebar valleys 326. Anaxial height H2 (FIG. 14) of the first plurality of handlebarprojections 324 above the first plurality of handlebar valleys 326 is asecond height. The handlebar mount 312 has a second handlebar mountengagement surface 328 (also shown in plan view in FIG. 16) extendingcircumferentially about the handlebar pivot axis P and having a secondplurality of handlebar mount projections 330 which alternate with asecond plurality of handlebar mount valleys 332. An axial height H3(FIG. 13) of the second plurality of handlebar mount projections 330above the second plurality of handlebar mount valleys 332 is a thirdheight. The handlebar 314 has a second handlebar engagement surface 334extending circumferentially about the handlebar pivot axis P and havinga second plurality of handlebar projections 336 which alternate with asecond plurality of handlebar valleys 338. An axial height H4 (FIG. 14)of the second plurality of handlebar projections 336 above the secondplurality of handlebar valleys 338 is a fourth height. Referring toFIGS. 11 and 12, a handlebar biasing member, which may be, for example,a helical coil compression spring 340 on the tensioner rod 196, urgesthe first and second handlebar engagement surfaces 322 and 334 axiallytowards engagement with the first and second handlebar mount engagementsurfaces 316 and 328 respectively.

When the two wave-shaped surfaces shown in FIGS. 2-7 pass over eachother (e.g. during swiveling of the handlebar assembly 108), theprojections repeatedly ride over one another and then ride down into theadjacent valleys. This can be annoying to a rider who wants to move thehandlebar quickly and easily between the use and storage positions. Theamount of axial movement that arises when the handlebar assembly 108 isbeing swiveled or pivoted between the use and storage positions is basedon the lesser of the heights between the projections and the valleys onthe mutually engaged wave-shaped surfaces. For example if one surfacehas a height of 3 mm and the other surface has a height of 5 mm, thenwhen the wave-shaped surfaces ride over one another, the handlebarassembly will only move axially by 3 mm (the lesser of the two heights).Thus the lesser of the two heights determines the amount of axialmovement that the handlebar assembly 108 will incur during swiveling (orin any two mutually engaged wave-shaped surfaces). In order to eliminatethe repeated riding of projection on projection and subsequent decentinto the adjacent valley during pivoting between the use and storagepositions, the handlebar 314 and the handlebar mount 312 are providedwith the second engagement surfaces 328 and 334, which, when engagedprojection to projection substantially prevent the projections on thefirst engagement surfaces 316 and 322 from engagement with one another.This may be characterized by configured the surfaces 316, 322, 328 and334 such that a lesser of the third and fourth heights H3 and H4 isgreater than a lesser of the first and second heights. In an example,the heights H3 and H4 may both be about 6 mm and the heights H1 and H2may both be about 3 mm.

Additionally, it will be noted that the number of ‘clicks’ (ascents toprojection to projection engagement and subsequent descents ofprojection to valley engagement), that occurs during pivoting isdependent on the number of projections and valleys two mutually engagedsurfaces have, and more specifically on the number projections andvalleys on whichever of the mutually engaged surfaces has moreprojections. In the present example, the two first engagement surfaces316 and 322 both have 6 projections and 6 valleys. By configuring thesecond engagement surfaces 328 and 334 and the first engagement surfaces316 and 322 such that the greater number of projections on the firstsurfaces 316 and 322 is greater than the greater number of projectionson the second surfaces 328 and 334, there are fewer ‘clicks’ whenpivoting than there would be if the second engagement surfaces 328 and334 were not present. Worded another way, the greater of the number offirst handlebar projections 324 and the number of first handlebar mountprojections 318 is greater than a greater of the number of secondhandlebar projections 336 and the number of second handlebar mountprojections 330. In at least some embodiments, the greater of the numberof first handlebar projections 324 and the number of first handlebarmount projections 318 is a multiple of the greater of the number ofsecond handlebar projections 334 and the number of second handlebarmount projections 328. In an example, there may be six first handlebarprojections 324 and handlebar mount projections 318 and two secondhandlebar projections 334 and handlebar mount projections 328.

Preferably, at least one of the second handlebar or handlebar mountprojections is generally flat has a constant axial height over aselected angular range. In the present example, the second handlebarmount projections 330 are generally flat axially over an angular rangeof about 150 degrees.

At the use and storage positions, the first handlebar projections 324engage the first handlebar mount valleys 320 and the second handlebarprojections 334 engage the second handlebar mount valleys 330.

During pivoting of the handlebar 314 between the use and storagepositions, engagement of the second handlebar projections 334 with thesecond handlebar mount projections 328 substantially prevents engagementof the first handlebar projections 324 with the first handlebar mountprojections 318.

The engagement surfaces 316, 322, 328 and 334, and the tensioner rod 196and biasing member 340 that urge the engagement surfaces into engagementwith one another constitute a pivot joint 342 for the vehicle 300. Thepivot joint 342 optionally includes the quick release lever 172 andother associated structure (e.g. the tensioner member 196 and thetensioner anchor 204) which together forms a cam locking structure,thereby providing the pivot joint 300 with locking capability so that itis a locking pivot joint. In some embodiments, however, the pivot joint342 does not include the quick release lever 172, but does include abiasing member 340 and the tensioner member 196 (if needed for biasing)so as to apply a biasing force that urges the surfaces 316, 322, 328 and334 into engagement with one another to inhibit the handlebar 314 frompivoting out of the use position during use.

Furthermore, the pivot joint 342 is shown as being incorporated into afoot-deck based vehicle. However, it will be understood that the pivotjoint 342 may be incorporated into any other device where it isbeneficial to do so. The handlebar mount 312 described above may morebroadly be referred to as a first pivotable member 312, and thehandlebar 314 may more broadly be referred to as a second pivotablemember 314. The pivot joint 342 may be used to permit the firstpivotable member 312 to be pivoted between a first pivot joint position(e.g. the position shown in FIG. 8A) and a second pivot joint position(e.g. the position shown in FIG. 8B). The first handlebar mountengagement surface 316 may thus be referred to as a first pivotablemember first engagement surface 316 or alternatively a first engagementsurface 316 of the first pivotable member 312, which has a firstplurality of first pivotable member projections 318 which alternate witha first plurality of first pivotable member valleys 320. An axial heightH1 (FIG. 13) of the first plurality of first pivotable memberprojections 318 above the first plurality of first pivotable membervalleys 320 is a first height. The second pivotable member 314 has asecond pivotable member first engagement surface 322, which may also bereferred to as a first engagement surface 322 of the second pivotablemember 314, extending circumferentially about the pivot axis P for thesecond pivotable member 314, and having a first plurality of secondpivotable member projections 324 which alternate with a first pluralityof second pivotable member valleys 326. An axial height H2 (FIG. 14) ofthe first plurality of second pivotable member projections 324 above thefirst plurality of second pivotable member valleys 326 is a secondheight.

The first pivotable member 312 has a first pivotable member secondengagement surface 328, which may also be referred to as a secondengagement surface of the first pivotable member 312, which extendscircumferentially about the pivot axis P and which has a secondplurality of first pivotable member projections 330 which alternate witha second plurality of first pivotable member valleys 332. An axialheight H3 (FIG. 13) of the second plurality of first pivotable memberprojections 330 above the second plurality of first pivotable membervalleys 332 is a third height. The second pivotable member 314 has asecond pivotable member second engagement surface 334, which may also bereferred to as a second engagement surface 334 of the second pivotablemember 314, and which extends circumferentially about the pivot axis Pand which has a second plurality of second pivotable member projections336 which alternate with a second plurality of second pivotable membervalleys 338. An axial height H4 (FIG. 14) of the second plurality ofsecond pivotable member projections 336 above the second plurality ofsecond pivotable member valleys 338 is a fourth height. Referring toFIGS. 11 and 12, the handlebar biasing member 340 may also be referredto as a pivot joint biasing member 340.

Referring to FIGS. 15-18, the pivot joint 342 may optionally furtherinclude a limiter post shown at 350 (FIGS. 16-18), which engages firstand second limiter surfaces shown at 352 and 354 (FIG. 15) on a post 356that may be similar to the post 350. These limiter surfaces 352 and 354cooperate with the post 350 to prevent the handlebar 314 from travelingpast the storage and use positions when being pivoted.

Reference is made to FIGS. 19-21 which show a vehicle in accordance withanother embodiment of the present disclosure. The vehicle is a sportstroller 420 that has a seat 424 for supporting a child, a canopy 426for protecting the seated child from sun and/or rain, and a safety guard428 for restraining the child in the seat 424. A front wheel 432 isretained between a fork 436 that is rotatably held within a head tube440. A pair of pedals 441 is coupled to front wheel 432 for drivingsport stroller 420 forward, and a handlebar 442 enables a child to steerfront wheel 432. A steering linkage 444 is coupled to the fork 436 inthe head tube 440, and travels along a top tube 448 to a rear bracket452 of the frame of the sport stroller 420. A handle 456 is rotatablyheld within the rear bracket 452 and coupled to the steering linkage 444such that rotation of the handle 456 turns the fork 436 and the frontwheel 432. As will be appreciated, sport stroller 420 can be operated bya child as a tricycle via the pedals 441 and a handlebar 442, or can bepushed and steered by an adult via the handle 456. In the latter case, achild seated on the sport stroller 420 can rest their feet on the footrests 458 and the pedals 441 can be removed or disconnected so as not tospin with the front wheel 432.

The rear bracket 452 houses a central pivot joint 460. A pair of pivotmembers that pivot relative to each other via the central pivot joint460, namely rear wheel struts 464, extend from central pivot joint 460.Each of the rear wheel struts 464 end at a wheel pivot joint 468. A locklever 472 of a biasing mechanism, in this case a quick release skewer,locks and unlocks each the wheel pivot joint 468. Also coupled to eachwheel pivot joint 468 is a rear wheel 476. As will be apparent, the rearbracket 452 of the frame is also a pivot member in central pivot joint460, as the central pivot joint 460 permits pivoting of either or bothof the rear wheel struts 464 relative to the rear bracket 452.

The sport stroller 420 is readily convertible between a three-wheelconfiguration and a two-wheel configuration. In the three-wheelconfiguration, as shown in FIGS. 19 to 22, the rear wheel struts 464 ofthe sport stroller 420 extend laterally and rearwardly in a splayedmanner. The rear wheels 476 secured to the distal ends of the rear wheelstruts 464 are held apart a distance so that the front wheel 432 and therear wheels 476 afford stability and resistance to tipping over whilethe sport stroller 420 is unsupported or is being driven forward by aperson via the handle 456.

In the two-wheel configuration, as will be described below, the rearwheels 476 are rotated about the wheel pivot joints 468 so that they arepositioned between the rear wheel struts 464 of the sport stroller 420,and the rear wheel struts 464 are brought together so that the rearwheels 476 effectively form a single wheel. This wheel configurationmakes the sport stroller 420 relatively more maneuverable.

Referring now to FIG. 23, wheel pivot joint 468 for the right rear wheel476 is shown in greater detail. The rear wheel strut 464 has an enlargedend 480 that has a locking face 484 formed on a surface around a centralpost 488. Central post 488 has a coaxial aperture. A corresponding wheelsupport 492 has a bore 496 dimensioned to receive central post 488snugly, and has a stepped diameter to limit travel of central post 488.A locking face 500 corresponding to locking face 484 is formed aroundbore 496. An axle bore 504 enables rotational coupling to the rear wheel476 via an axle (not shown). A washer 508 is placed between the centralpost 488 and the bore 496 to spread pressure that is applied between theenlarged end 480 and the wheel support 492. The quick release skewerthat biases the locking faces 484 and 500 together includes a tensionermember 501 pivotally coupled to the lever 472 and inserted through theaperture in the central post 488 and the bore 496 in the wheel support492 and retained in place via an anchor member 502. The tensioner member501 can be a rod, a cable, or the like, and the anchor member 502 may besecured to the tensioner member 501 or formed integrally therewith. Therear wheel strut 464 and the wheel support 492 are pivot members thatpivot relative each other via the wheel pivot joint 468.

FIG. 24 shows the locking face 500 in greater detail. The locking face500 has a pattern of protrusions 512 that project from a face plane 516optionally at regular angular intervals around a pivot axis 520, whichis orthogonal to the face plane 516. The pattern of protrusions 512 maybe generally sinusoidal in profile around the pivot axis 520, with theprotrusions 512 extending radially about the pivot axis 520. It will benoted that the protrusions 512 could alternatively project at irregularintervals around the pivot axis 520 and could have varying widthsinstead of having a common width, while ensuring that the locking faces500 and 482 nest together snugly in at least two different positions.

Referring now to FIGS. 24 and 25, the shape of the protrusions 512 isdiscussed in greater detail. In particular, FIG. 25 shows the profile ofthe protrusions 512 along a line of fixed radius from the pivot axis520. For the purpose of clarity, the profile of protrusions 512 will bediscussed in a counter-clockwise direction in FIG. 24 and in aleft-to-right direction in FIG. 25. Each protrusion 512 has an incliningsurface region 524, a declining surface region 528, an apex surfaceregion 532, and a trough surface region 536. The inclining surfaceregion 524 has an inclination angle of approximately 40 degrees relativeto the face plane 516. The declining surface region 528 has adeclination angle of approximately 40 degrees relative to the face plane516. Apex surface region 532 extends about 15% of the angular period ofthe locking face 500, includes the apex, and transitions between theinclination angle and the declination angle. Further, the apex surfaceregion 532 is generally free of planar portions that are substantiallyparallel to the face plane 516, as such planar portions may enableopposing protrusions to rest thereon instead of being urged into thetroughs between protrusions 512 by the biasing force of the biasingmechanism. The trough surface region 536 includes the nadir andtransitions between a lower declination angle than that of the decliningsurface region 528 and a lower inclination angle than that of asubsequent inclining surface region 524.

It is desirable in some circumstances for the inclining surface region524 (and the declining surface region 528, where it is desired tofacilitate bi-directional pivoting) to have an inclination angle (ordeclination angle for the declining surface region 528) of at leastabout 30 degrees relative to the face plane 516 in order to resistrotation relative to the opposing locking face 484 when the wheel pivotjoint 468 is compressed in a locked mode.

Further, it is desired to have the apex surface region 532 extend atleast about 10% of the angular period. In some cases, it can be desiredto have the apex surface region 532 extend at least about 20% of theangular period. This reduces the separation distance required betweenthe locking faces 484 and 500.

In this particular embodiment, the apex surface region 532 and thetrough surface region 536 transition smoothly to and from one another(i.e., substantially without discontinuities and therefore beinggenerally free of radially-extending edges).

Further, the inclining surface region 524 and the apex surface region532 are complements of the declining surface region 528 and trough thesurface region 536, and the pattern of protrusions on the locking face484 is the same as on locking face 500. As a result, the protrusions 512of the locking face 484 and 500 complement and mesh when locking faces484 and 500 are biased against each other.

Still further, in this embodiment, the inclining surface region 524 is amirror image of the declining surface region 528.

In many cases, the inclination angle of the inclining surface region 524relative to the face plane 516 is selected to be less than about 60degrees relative to the face plane 516, as it has been found that if theinclination angle exceeds about 60 degrees, it may be difficult to pivotwheel support 492 relative to the rear wheel strut 464 even when theforce biasing the locking faces 484 and 500 together is reduced. Thisangle depends on the friction coefficient of the materials used, thebiasing force in the pivot mode, etc.

Referring now to FIGS. 23 to 25, the quick release skewer has two modesbetween which it can be conditioned. In a locked mode, the lever 472 isswiveled into a recess of the rear wheel strut 464, preventingaccidental engagement of the lever 472 and applying a greater tensionalong the tensioner member 501 and thus a greater biasing force biasingthe locking faces 484 and 500 together. In this mode, the biasing forceis sufficient to inhibit relative rotation of the locking faces 484 and500.

The quick release skewer can be conditioned to a pivot mode by urging alever portion of the lever 472 out of the recess and away from the rearwheel strut 464, thus applying a lesser tension along the tensionermember 501 and thus a lesser biasing force biasing the locking faces 484and 500 together. As can be seen, a cam-shaped portion of the lever 472is contained in a recess of the enlarged end 480. In this mode, tensionis reduced on a tensioner member 501 of the quick-release skewer and thebiasing force is sufficiently weak to permit relative rotation of thelocking face 484 and locking face 500 upon application of a thresholdtorque. The threshold torque is sufficient to rotate the locking face484 relative to the locking face 500, thus overcoming the additionalbiasing force exerted by the quick release skewer as a result of theseparation distance required between the locking faces 484 and 500, andany friction between them. Thus, the rear wheel 476 can be pivoted fromits position shown in FIGS. 19 to 21 rearwardly and inwardly relative tothe wheel pivot joint 468.

Upon pivoting the rear wheel 476, the lever 472 can be urged back intothe recess of the rear wheel strut 464 to lock the rotationalorientation of the rear wheel 476 relative to the rear wheel strut 464.

The left rear wheel 476 is pivoted inwardly around the correspondingwheel pivot joint 468.

Once rear wheels 476 are pivoted inwardly around the wheel pivot joints468, the rear wheel struts 464 can be pivoted via the central pivotjoint 460 to bring inwardly folded the rear wheels 476 together.

FIG. 26 shows various components of the central pivot joint 460. Thecentral pivot joint 460 has a housing 540 that has a cylindrical cavitydefined by two side walls 544 and 548. The side wall 544 has a recess552 in its surface that extends along the base of housing 540. A centralpost 556 projects through the central cavity of the housing 540. Alocking face 560 extends around the central post 556.

The left rear wheel strut 464 has an annular portion 564 dimensioned tofit snugly within the cavity of the housing 540 between central post 556and side walls 544 and 548. The annular portion 564 has a first lockingface 568 on a first side and a second locking face 572 on a second side.

The right rear wheel strut 464 has an annular portion 576 dimensioned tofit snugly within the cavity of housing 540 between the side walls 544and 548 and capping the central post 556. Annular portion 576 has alocking face 580 on a first side and is generally planar on a secondside, with an aperture 584 that aligns with an aperture in the centralpost 556 when annular portion 576 is placed within the cavity of housing540.

The locking faces 560, 568, 572, and 580 have the same pattern ofprotrusions as the locking faces 484 and 500.

A quick release skewer holds together the central pivot joint 460 undertension. The quick release skewer has a lever 588 that is coupled to atensioner member 589 at a first end. The tensioner member 589 passesthrough apertures in the central post 556 and annular portions 564 and576 and is coupled to a tensioner anchor 590 at its other end.

The lever 588 has a cam-shaped portion 592 with a lever portion 596extending therefrom for rotating the cam-shaped portion 592. Thecam-shaped portion 592 is nested within the recess 552 in the base ofthe housing 540.

The quick release skewer of the central pivot joint 460 has two modesbetween which it can be conditioned. In a locked mode, the lever portion596 is swiveled into and nests in the recess 552 of the housing 540,applying a greater tension along the tensioner member 589 and thus agreater biasing force biasing together corresponding pairs of lockingfaces 560 and 568, and 572 and 580. In this mode, the biasing force issufficient to inhibit rotation of the locking face 560 relative to thelocking face 568, and of the locking face 572 relative to the lockingface 580.

The quick release skewer can be conditioned to a pivot mode by urgingthe lever portion 596 of the lever 588 out of the recess 552 and awayfrom the housing 540, thus reducing tension along the tensioner member589 and thus reducing the biasing force biasing the locking faces 560and 568, and the locking faces 572 and 580 together. In this mode, thebiasing force is sufficiently weak to permit rotation of the lockingface 560 relative to the locking face 568, and of the locking face 572relative to the locking face 580 upon application of a threshold torque.Thus, rear wheel struts 464 can be pivoted from their position shown inFIGS. 19 to 21 to bring the rear wheels 476 together. The gaps betweenthe side walls 544 and 548 define the ranges of motion of the rear wheelstruts 464.

FIG. 27 shows the configuration of the sport stroller 420 once rearwheels 476 have been brought together via pivoting of rear wheel struts464. As shown, rear wheels 476 can effectively act as a single rearwheel in this configuration.

The lever portion 596 can be urged back into the recess 552 to lock therear wheel struts 464 in this configuration.

When it is desired to recondition (i.e. reposition) the sport stroller420 to be a three-wheeled vehicle as shown in FIGS. 19 to 21, the leverportion 596 is urged out of the recess 552 of housing 540 to reducetension in the central pivot joint 460. The rear wheel struts 464 canthen be pivoted to separate the rear wheels 476. Once rear wheel struts464 are separated, the lever portion 596 is urged back into the recess552, thereby locking rear wheel struts 464 in their relativeorientation. For each rear wheel 476, lever 472 is urged out of itsrecess in rear wheel strut 464, and the rear wheel 476 is rotated aboutthe wheel pivot joint 468 back to its position as shown in FIGS. 19 to21. Lever 472 is then pushed back into the recess in the rear wheelstrut 464 to lock rear wheel 476 in this position.

The pivot joints of the above embodiment require less of a reduction intension going from a locked mode to a pivot mode in order to pivot onepivot member relative to another. This is because the relativeseparation distance required between the pivot members is reduced by asmuch as 35% or more in some scenarios. This is illustration in FIG. 28,in which a prior art protrusion pattern is superimposed on theprotrusion pattern of FIG. 25. As can be seen, the separation distance600 required with the prior art protrusion pattern is markedly largerthan the separation distance 604 when using the protrusion patterndescribed herein. Further, the “peak” of the prior art protrusionpattern is a radially-extending edge that decreases smoothness ofrotation of opposing locking faces.

The protrusion pattern of the above embodiment provides a smoothtransition between adjustments as opposing protrusion patterns ease intothe next adjustment instead of enabling the biasing mechanism to rapidlyurge one locking face towards the other once the apexes are passed.

In can be advantageous in some scenarios to size the protrusions so thatthe relative positions of protrusions on opposing locking faces can bereadily determined via a visual inspection, thus providing the user avisual indication when the pivot joint is securely fastened. In somescenarios, it has been found that protrusions having a visible widthbetween apexes of at least about three millimeters and at least aboutthree millimeters in height relative to the face plane enables therelative positions of protrusions on opposing locking faces to bereadily determined visually.

The reduction in separation distance can reduce the amount ofslack/rattle that is created in a pivot joint over time. As a result, afixed cam lever that is calibrated at the factory is more likely toremain calibrated for a markedly longer period of time and has a reducedchance of mechanical failure. Further, less tension is required to beovercome in order to rotate one pivot member relative to another.

It will be appreciated that the protrusion pattern can be altered invarious ways. For example, the depth of the troughs and/or the height ofthe apexes can be reduced.

The above protrusion patterns described facilitate rotational movementof one pivot member relative to another in two directions. Otherprotrusion patterns can be employed that facilitate rotation of a pivotmember in one direction.

FIGS. 29 and 30 show two alternative protrusion patterns that facilitatecounter-clockwise rotation of one pivot member relative to another,while still providing a reduced separation distance.

While the patterns of protrusion in the above-described embodiments allextend along radii originating at the pivot axis, various other patternsof protrusions can be employed such that two opposing locking faces havea number of angular intervals at which the protrusions of each lockingface are received within troughs of the opposing locking face. Forexample, protrusions having sinusoidal profiles can be employed inconcentric annuluses of the locking faces, where the protrusions areout-of-phase from one or more adjacent annuluses. The correspondinglocking face is configured such that its protrusions along each of itscorresponding concentric annuluses simultaneously fit within troughs ofthe locking face at a number of angular orientations. In anotherexample, the protrusions may extend spirally on the locking faces.

The locking faces may be non-planar. For example, opposing locking facesmay be conical, with one being convex and the other being concave. It isdesired, however, to have protrusions on the locking faces that areequidistant from the pivot axis to be co-planar on their own faceplanes. Thus, locking faces may have more than one face plane.

The angular period of the locking faces can be varied significantlywhile remaining within the teachings of the disclosure. In theembodiment described above, an angular period of 20 degrees is employed.In another embodiment, the angular period can be 30 degrees. In afurther embodiment, the angular period can be 60 degrees.

Throughout the present disclosure, the terms ‘protrusion’, ‘apex surfaceregion’, and ‘projection’ may be substituted for one another; the term‘trough surface region’ and the term ‘valley’ may be substituted for oneanother; the term

Persons skilled in the art will appreciate that there are yet morealternative implementations and modifications possible, and that theabove examples are only illustrations of one or more implementations.The scope, therefore, is only to be limited by the claims appendedhereto.

1. A foot-deck-based vehicle, comprising: a foot deck having a front endand a rear end; a front wheel assembly mounted at the front end of thefoot deck and a rear wheel assembly mounted at the rear end of the footdeck; a handlebar mount on the foot deck and a handlebar that extendsfrom the handlebar mount, wherein the handlebar mount defines ahandlebar pivot axis and has a first handlebar mount engagement surfaceextending circumferentially about the handlebar pivot axis and having afirst plurality of handlebar mount projections which alternate with afirst plurality of handlebar mount valleys, wherein an axial height ofthe first plurality of handlebar mount projections above the firstplurality of handlebar mount valleys is a first height, wherein thehandlebar has a first handlebar engagement surface extendingcircumferentially about the handlebar pivot axis and having a firstplurality of handlebar projections which alternate with a firstplurality of handlebar valleys, wherein an axial height of the firstplurality of handlebar projections above the first plurality ofhandlebar valleys is a second height, wherein the handlebar mount has asecond handlebar mount engagement surface extending circumferentiallyabout the handlebar pivot axis and having a second plurality ofhandlebar mount projections which alternate with a second plurality ofhandlebar mount valleys, wherein an axial height of the second pluralityof handlebar mount projections above the second plurality of handlebarmount valleys is a third height, wherein the handlebar has a secondhandlebar engagement surface extending circumferentially about thehandlebar pivot axis and having a second plurality of handlebarprojections which alternate with a second plurality of handlebarvalleys, wherein an axial height of the second plurality of handlebarprojections above the second plurality of handlebar valleys is a fourthheight; and a handlebar biasing member that urges the first and secondhandlebar engagement surfaces axially into engagement with the first andsecond handlebar mount engagement surfaces, respectively, wherein agreater of the number of first handlebar projections and the number offirst handlebar mount projections is greater than a greater of thenumber of second handlebar projections and the number of secondhandlebar mount projections, wherein a lesser of the third and fourthheights is greater than a lesser of the first and second heights,wherein the handlebar is precessively pivotable about the handlebarpivot axis between a use position and a storage position, wherein thehandlebar extends farther away from the foot deck in the use positionthan in the storage position, wherein at the use and storage positionsthe first handlebar projections engage the first handlebar mount valleysand the second handlebar projections engage the second handlebar mountvalleys, and wherein, during pivoting of the handlebar between the useand storage positions, engagement of the second handlebar projectionswith the second handlebar mount projections substantially preventsengagement of the first handlebar projections with the first handlebarmount projections.
 2. A foot-deck-based vehicle as claimed in claim 1,wherein the greater of the number of first handlebar projections and thenumber of first handlebar mount projections is a multiple of the greaterof the number of second handlebar projections and the number of secondhandlebar mount projections.
 3. A foot-deck-based vehicle as claimed inclaim 1, wherein in the use position the handlebar extends generallyperpendicularly to a foot-support surface of the foot deck and in thestorage position the handlebar extends generally parallel to thefoot-support surface.
 4. A foot-deck-based vehicle as claimed in claim1, further comprising a cam lock lever pivotally connected to a firstend of a tensioner member and a tensioner anchor, wherein the cam locklever is movable between a lock position and a release position,wherein, in the lock position, the cam lock lever cooperates with thetensioner anchor to clamp the first and second handlebar engagementsurfaces into engagement with the first and second handlebar mountengagement surface.
 5. A foot-deck-based vehicle as claimed in claim 1,wherein the front wheel assembly includes a front wheel support having afirst end with a first front wheel rotatably mounted thereto and asecond end with a second front wheel rotatably mounted thereto, andwherein the front wheel support is pivotably mounted to the foot deckabout a front wheel support pivot axis that is at an angle of greaterthan 0 degrees and less than 90 degrees from a vertical axis such thatleaning on a first side or on a second side of the foot deck causespivoting of the front wheel support, and a front wheel support biasingmember that urges the front wheel support towards a neutral positionwhen the front wheel support is pivoted away from the neutral position.6.-25. (canceled)
 26. A pivot joint, comprising: a first pivot memberand a second pivot member, each of the first pivot member and the secondpivot member having a locking face with a pattern of protrusionsprojecting from a face plane at angular intervals around a pivot axis towhich the face plane is orthogonal and defining an angular period, eachprotrusion comprising: a first surface region having an inclinationangle relative to the face plane; a second surface region having adeclination angle relative to the face plane; and a third surface regionextending at least about 10% of the angular period, the third surfaceregion transitioning between the inclination angle and the declinationangle and comprising an apex of the protrusion, the third surface regionbeing free of planar portions that are substantially parallel to theface plane; and a biasing member exerting a biasing force in a pivotmode to bias the locking faces of the pivot members together, thebiasing force being sufficiently weak to permit rotation of the firstpivot member about the pivot axis relative to the second pivot memberwhen a threshold torque is applied to the first pivot member relative tothe second pivot member.
 27. The pivot joint of claim 26, wherein theprotrusion is free of surface regions having an inclination angle ofmore than about 60 degrees.
 28. The pivot joint of claim 26, wherein theprotrusions extend radially.
 29. The pivot joint of claim 26, whereinthe pattern of protrusions of the first pivot member complements thepattern of protrusions of the second pivot member.
 30. The pivot jointof claim 26, wherein the protrusions are free of generallyradially-extending edges.
 31. The pivot joint of claim 26, wherein theinclination angle is generally equal in magnitude to the declinationangle.
 32. The pivot joint of claim 26, wherein the biasing forcecomprises a first biasing force, and wherein the biasing member is partof a biasing mechanism that can be conditioned to a locked mode in whichthe biasing mechanism exerts a second biasing force to bias the patternsof protrusions of the locking faces of the first pivot member and thesecond pivot member together, the biasing force being sufficientlystrong to inhibit rotation of the first pivot member about the pivotaxis relative to the second pivot member when a torque is applied to thefirst pivot member relative to the second pivot member.
 33. A quickrelease mechanism, comprising: a first connection member that is forconnection to a second connection member, wherein the first connectionmember comprises an aperture and a recess in the surface; and a quickrelease skewer comprising: a tensioner member extending through theaperture; an anchor member secured to a first end of the tensionermember; and a lever having a cam-shaped portion pivotally coupled to asecond end of the tensioner member distal from the first end, and alever portion extending from the cam-shaped portion for rotating thecam-shaped portion between a first orientation and a second orientationin which tension is increased on the tensioner, and at least some of thelever portion nests in the recess.
 34. The quick release mechanism ofclaim 33, wherein the lever portion nests in the recess.
 35. The quickrelease mechanism of claim 33, wherein the recess is longer than thelever portion.
 36. The quick release mechanism of claim 33, wherein thecam-shaped portion nests within the recess. 37.-38. (canceled)